Transmission Test Platform For Dvb-t Receiver Prototype Design And Realization

With the development of the standard of living and the need of entertainment, the traditional analogue TV can't satisfy people's need. Digital TV Instead of analogue TV becomes coming TV mode. There are two standars of Digital TV, one is the DVB of the the European Telecommunication Standards Institute(the ISDB-T of Japan DiBFG is derived from DVB); the other is the DTV of USA Advanced Television Systems Committee. The DVB-T standard for terrestrial digital television roadcasting has been tested and accepted in Europe, Australia and Singapore. The standard describes the basic transmission system of terrestrial digital television roadcasting. DVB-T has been applied in UHF channel in these years. The design of transmission and test system in this thesis can improve the emulation speed of DVB-T greatly, increase the emulation accuracy, and get the system performance in various channel conditions agilely and effectively.The thesis describes the principles of Orthogonal Frequency Division Multiplexing and terrestrial digital television roadcasting system, researches and describes the transmission channel model of terrestrial digital television roadcasting system, ascertains algorithm and carries out the simulation of channel which is based on c. It also designs the fast transmission channel based on USB, the emphasis is : the configuration and hardware design of the fast transmission channel, the principle of USB, the design of the firmware of USB chip based on extended c ,and the design of host dynamic link library program based on VC++, and give the parameters of transmission channel and system emulation result.The first chapter of this thesis is to introduce the history and present status of digital TV and the principle of OFDM, and give the frame figure of the transmission test system. In the second chapter, it introduces DVB-T system principle and system frame figure. The description of the channel model of wireless transmission channel is in chapter 3. This chapter introduces the waveform's transmission trait in air, wireless fade channel's characters, wireless channel's noise and interference,DVB-T system channel model and it's realization in c programming. The high speed transmission channel based on USB is described in chapter 4 and chapter 5. It gives the channel's principle and design, particularly in USB protocol, channel's hardware, USB chip's firmware and host application program.